Sony KV-20S90, KV-21SE43C service manual Diagrams, Circuit Boards Location, Reference Information

KV-20S90 / 21SE43C

SECTION 5: DIAGRAMS

5-1. CIRCUIT BOARDS LOCATION

C Board

A Board

5-2. PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM INFORMATION

All capacitors are in µF unless otherwise noted. pF : µµF 50WV or less are not indicated except for electrolytics and tantalums.

All electrolytics are in 50V unless otherwise specifi ed. All resistors are in ohms. K=1000, M=1000k

Indication of resistance, which does not have one for rating electrical power, is as follows:

Pitch : 5mm

Rating electrical power : 1/ 4 W

1/ 4 W in resistance, 1/10 W and 1/ 8 W in chip resistance. : nonfl ammable resistor.

: fusible resistor. : internal component.

: panel designation and adjustment for repair.

All variable and adjustable resistors have characteristic curve B, unless otherwise noted.

Readings are taken with a color-bar signal input.

Readings are taken with a 10M digital multimeter.

Voltages are DC with respect to ground unless otherwise noted. Voltage variations may be noted due to normal production tolerances. All voltages are in V.

S : Measurement impossibillity.

: B+line.

: B-line. (Actual measured value may be different). : signal path. (RF)

Circled numbers are waveform references.

The components identifi ed by X in this basic schematic diagram have been carefully factory-selected for each set in order to satisfy regulations regarding X-ray radiation. Should replacement be necessary, replace only with the value originally used.

When replacing components identifi ed by Y, make the necessary adjustments as indicated. If the results do not meet the specifi ed value, change the component identifi ed by X and repeat the adjustment until the specifi ed value is achieved. (Refer to Safety Related Adjustments on Page 14.)

When replacing the parts listed in the table below, it is important to perform the related adjustments.

Part Replaced (		)	Adjustment ( )
DY, C511, C574, C575, D572,			HV HOLD-DOWN
D573, D574, R582, R583, R584,			R582
R585, R586, R578, R625, R626,
R640, R635,T504, IC301, IC521,
IC602	A Board

REFERENCE INFORMATION

RESISTOR	: RN	METAL FILM
	: RC	SOLID
	: FPRD	NONFLAMMABLE CARBON
	: FUSE	NONFLAMMABLE FUSIBLE
	: RW	NONFLAMMABLE WIREWOUND
	: RS	NONFLAMMABLE METAL OXIDE
	: RB	NONFLAMMABLE CEMENT
	:	ADJUSTMENT RESISTOR
COIL	: LF-8L	MICRO INDUCTOR
CAPACITOR	:TA	TANTALUM
	: PS	STYROL
	: PP	POLYPROPYLENE
	: PT	MYLAR
	: MPS	METALIZED POLYESTER
	: MPP	METALIZED POLYPROPYLENE
	: ALB	BIPOLAR
	: ALT	HIGH TEMPERATURE
	: ALR	HIGH RIPPLE

The components identified by shading and !symbol are critical for safety. Replace only with part number specified.

The symbol indicates a fast operating fuse and is displayed on the component side of the board. Replace only with fuse of the same rating as marked.

Les composants identifies per un trame et une marque ! sont critiques pour la securite. Ne les remplacer que par une piece portant le numero specifie.

Le symbole indique une fusible a action rapide. Doit etre remplace par une fusible de meme yaleur, comme maque.

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